Model of contact interaction in threaded joint equipped with spring-loaded collet

Shatskyi, Ivan; Ropyak, Lіubomyr; Velychkovych, Andrii

doi:10.5267/j.esm.2020.4.002

Cited by 38 publications

(17 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The differential equation of the fibula deflections is as follows:

where w is the deflection of the fibula, E b is the average Young's modulus of the bone tissues, J is the average axial moment of inertia of the fibula cross section, and H ( x ) is the Heaviside function. By twice integration of equation ( 1 ) and taking into account the boundary conditions [ 33 , 37 ], we obtain expressions for determining the angles of rotation ϑ ( x )=d w /d x and deflections w ( x ). Examining the expression of deflections to the extreme, we obtained a formula to specify the allowable force P =[ P ] at which the condition of stiffness of the fibula w max ≤ [ w ] will be satisfied (maximum deflection w max does not exceed the allowable value [ w ]).…”

Section: Resultsmentioning

confidence: 99%

“…From the point of view of modern biomechanics and medical engineering, the effects of contact interaction between the implant and biological tissues, as well as methods of reliable attachment of elements, are of interest [ 32 , 33 ]. The work in [ 34 ] presents an analytical approach to simulate contact phenomena in a composition of two different materials; in particular, one of them has the features of biological structure, and the another one hasan artificial material with constant physical properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

Chuzhak

Sulyma

Ropyak

et al. 2021

Journal of Healthcare Engineering

View full text Add to dashboard Cite

Introduction. Specification of possible stress factors destabilizing the fibula stable osteosynthesis by the intramedullary nail with distal blocking and elastic fixation of distal syndesmosis by the thread with endobuttons by mathematical modelling of distal unstable ankle injuries. Material and Methods. We studied the thread tension during the combined stable-elastic fixation of unstable injuries of the ankle joint in cross-syndesmosis fractures of the fibula (B, C Danis–Weber classification), which includes a one-time stable minimally invasive fixation with the intramedullary nail and elastic fixation by the thread with endobuttons. We used a titanium alloy for the intramedullary nail and polyester for the thread. The deformed state was studied using the methods of mechanics. Results. A model of a fractured fibula blocked with the intramedullary nail and fixed with the elastic thread was developed. A formulation to specify the rational tension forces of the elastic thread depending on the parameters of the fibula and intramedullary blocking nail and on the location of the bone injury was obtained. The effect of foot rotation on the thread tension was investigated. The results of theoretical research should be implemented in medical practice. Conclusions. A mathematical model of the damaged fibula blocked by the intramedullary nail and fixed with the elastic thread was developed. Dependences for calculation of tension of the fixing thread were obtained. A slight increase in thread tension during foot rotation was found.

show abstract

“…The differential equation of the fibula deflections is as follows:

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

Chuzhak

Sulyma

Ropyak

et al. 2021

Journal of Healthcare Engineering

View full text Add to dashboard Cite

show abstract

“…Для покращення експлуатаційних властивостей бурильного інструмента застосовують низку методів. До конструкторських методів відносять удосконалення конфігурації бурильних труб [3,4], нарізних з'єднань [5][6][7], забезпечення точності нарізей [8][9][10] та запобігання самовідгвинчуванню [11], раціональний вибір матеріялів шляхом проведення корозійних досліджень і вивчення структурних змін металів [12][13][14], параметричну оптимізацію озброєння, опор і вузлів промивання доліт [15][16][17] тощо. Серед технологічних методів заслуговують на увагу раціональне армування сталевих деталей [18], оптимізація формоутворення гвинтових поверхонь та поверхонь складної топології [19,20], нанесення гнучких [21,22], металевих [23][24][25] та функціонально ´радієнтних [26][27][28] покриттів, зокрема оксидних [29], а також шліфування і лазерна обробка робочих поверхонь нарізей [30,31].…”

Section: вступ і постановка задачі дослідженняunclassified

Experimental Estimation of Design and Drilling Regime Option Influence on Drilling Tool Dynamics

Moysyshyn¹,

Lyskanych²,

Borysevych³

et al. 2021

Metallofiz. Noveishie Tekhnol.

View full text Add to dashboard Cite

За результатами експериментальних досліджень, проведених на буровому стенді, встановлено емпіричну залежність між коливаннями сталевого бурильного інструмента та його конструктивними і режимними чинниками. За досліджуваний параметр коливань вибрано середнє квадратичне відхилення (стандарт) вібропришвидшення, що реєстрували на траверсі стенда, тобто після пристрою зміни жорсткості та демпфування, який входить до складу компонування бурильного інструмента. До конструктивних чинників віднесено жорсткість та коефіцієнт демпфування згаданого пристрою, а до режимних чинників віднесено осьове статичне навантаження та частоту обертання сталевого тришарошкового долота. Постійними факторами під час проведення експерименту були тип і діаметр сталевого тришарошкового долота та витрата промивальної рідини. Для одержання емпіричних залежностей обрано метод раціонального планування експериментів, відповідно до якого кожна комбінація змінних чинників під час досліджень зустрічається тільки один раз. Планований факто-

show abstract

“…As a result, improved accuracy at low gas consumption was established. This advantage stipulated the expediency of using the developed PMC gas flow in the measuring channel of sen The threaded connections with selflocking from unscrew ing are used to maintain the tightness of the installations [18].…”

Section: So ˆXmentioning

confidence: 99%

Gas flow measuring system using signal processing on the basis of entropy estimations

Manuliak¹,

Melnychuk²,

Striletskyi³

et al. 2020

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

Purpose. To increase the accuracy of gas flow measurement in tachometric transducers based on the improvement of structural, hardware and algorithmic support of information and measuring systems. Methodology. The gas consumption value is determined by the parameters of information and measurement signals. Sensor signals interacting with the environment are traditionally processed on the basis of amplitude and frequency methods. The research methodology is based on the information theory, methods of statistical and spectral analysis, digital signal processing, the theory of gas dynamics, based on mathematical modeling in a computational experiment, as well as the theory of errors and measurement results uncertainty. The statistical characteristics of the measuring signals of the converter presented in the unitary basis are studied. Findings. The conducted research resulted in development of an information-measuring system to control the sensitivity threshold of the transducers of the primary volume and the volume of gas consumption based on the developed primary transducer, which allows providing relative standard uncertainty of cost determination within 0.5%. A special processor has been developed to calculate the entropy estimates of signal information. Originality. For the first time, a method for the formation and processing of information-measuring signals, which is based on the use of pressure pulsations due to the movement of the measuring element of the converter in the toroidal measuring cell, is proposed. Implementation of the measuring element of a spherical converter, whose density is almost commensurable with the density of the controlled medium is offered. Practical value. The proposed method allows providing a lower sensitivity threshold compared to the industrial implementation of tachometric type transducers.

show abstract

Model of contact interaction in threaded joint equipped with spring-loaded collet

Cited by 38 publications

References 1 publication

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

Experimental Estimation of Design and Drilling Regime Option Influence on Drilling Tool Dynamics

Gas flow measuring system using signal processing on the basis of entropy estimations

Contact Info

Product

Resources

About